OK, seems it doesn’t matter what I do, I am still getting multiple new spam blogs a day and the time taken to clean them out is non-trivial.
I have now disabled open sign-up. I would still dearly love to have genuine new bloggers and new blogs in the blog.me.uk domain. If you would like a blog here, please mail me and I will add you as a registered user.
Registered users may still create blogs so, if you are already registered, feel free to create further blogs as you desire.
Sorry about having to take this step; I will look into alternatives as soon as possible.